Magnetic relaxation in dysprosium-dysprosium collisions
Name
Newman-2011-Magnetic relaxation.pdf
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Author(s)
Newman, Bonna Kay
Brahms, Nathan
Au, Yat Shan
Johnson, Cort
Connolly, Colin B.
Doyle, John M.
Kleppner, Daniel
Greytak, Thomas J.
Date Issued
January 2011
Journal
Physical Review A
Publisher
American Physical Society
Citation
Newman, Bonna Kay et al. "Magnetic relaxation in dysprosium-dysprosium collisions." Phys. Rev. A 83, 012713 (2011) [5 pages] © 2011 American Physical Society.
Version
Final published version
Abstract
The collisional magnetic reorientation rate constant gR is measured for magnetically trapped atomic dysprosium (Dy), an atom with large magnetic dipole moments. Using buffer gas cooling with cold helium, large numbers (>1011) of Dy are loaded into a magnetic trap and the buffer gas is subsequently removed. The decay of the trapped sample is governed by collisional reorientation of the atomic magnetic moments. We find gR=1.9±0.5×10-11 cm3 s-1 at 390 mK. We also measure the magnetic reorientation rate constant of holmium (Ho), another highly magnetic atom, and find gR=5±2×10-12 cm3 s-1 at 690 mK. The Zeeman relaxation rates of these atoms are greater than expected for the magnetic dipole-dipole interaction, suggesting that another mechanism, such as an anisotropic electrostatic interaction, is responsible. Comparison with estimated elastic collision rates suggests that Dy is a poor candidate for evaporative cooling in a magnetic trap.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT-Harvard Center for Ultracold Atoms
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.83.012713
